<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>Bootstrap 实例</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
	<style>
		body {
			position: relative;
		}
		ul.nav-pills {
			top: 20px;
			position: fixed;
		}
		div.col-sm-9 div {
			height: 250px;
			font-size: 28px;
		}
		#section1 {color: #fff; background-color: #1E88E5;}
		#section2 {color: #fff; background-color: #673ab7;}
		#section3 {color: #fff; background-color: #ff9800;}
		#section41 {color: #fff; background-color: #00bcd4;}
		#section42 {color: #fff; background-color: #009688;}

		@media screen and (max-width: 810px) {
			#section1, #section2, #section3, #section41, #section42  {
				margin-left: 150px;
			}
		}
	</style>
</head>
<body data-spy="scroll" data-target="#myScrollspy" data-offset="20">

<div class="container">
	<div class="row">
		<nav class="col-sm-3" id="myScrollspy">
			<div class="container-fluid"> 
			<div class="container-fluid"> 
			<ul class="nav nav-pills nav-stacked">
				<li class="active"><a href="#section1">Section 1</a></li>
				<li><a href="#section2">Section 2</a></li>
				<li><a href="#section3">Section 3</a></li>
				<li class="dropdown">
					<a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
					<ul class="dropdown-menu">
						<li><a href="#section41">Section 4-1</a></li>
						<li><a href="#section42">Section 4-2</a></li>                     
					</ul>
				</li>
			</ul>
			</div>	
			</div>		
		</nav>
		<div class="col-sm-9">
			<div id="section1">    
				<h1>Section 1</h1>
				<p>Try to scroll this section and look at the navigation list while scrolling!</p>
			</div>
			<div id="section2"> 
				<h1>Section 2</h1>
				<p>Try to scroll this section and look at the navigation list while scrolling!</p>
			</div>        
			<div id="section3">         
				<h1>Section 3</h1>
				<p>Try to scroll this section and look at the navigation list while scrolling!</p>
			</div>
			<div id="section41">         
				<h1>Section 4-1</h1>
				<p>Try to scroll this section and look at the navigation list while scrolling!</p>
			</div>      
			<div id="section42">         
				<h1>Section 4-2</h1>
				<p>Try to scroll this section and look at the navigation list while scrolling!</p>
			</div>
		</div>
	</div>
</div>

</body>
</html>